JP5464733B2 - Trance - Google Patents

Description

  The present invention relates to a transformer used in various electronic devices.

  For transformers used in switching power supplies, etc., the insulation distance (creeping distance and clearance) between the core and the coil is defined by the safety standards of each country. As shown in FIGS. 15 to 18, such a transformer has a core formed by combining two E-type core divided bodies 101 including both end magnetic legs 102 and a central magnetic leg 103. The leg 103 is inserted into the through hole 112 of the bobbin 111 to constitute a magnetic circuit. After winding the winding wire 113 between the flanges 117 of the bobbin 111, an insulating sheet is wound around the outer periphery of the winding wire, and the lead wire of the winding wire 113 is connected to a plurality of terminal pins 114 implanted in the terminal block 115. (For example, patent document 1).

This transformer extends in a direction perpendicular to the legs of the core divided body 101 and cuts out the corner 104 at the lower part of the exposed portion of the core divided body 101 exposed from the bobbin 111 so that the terminal pin 114 and the core divided body are cut. The insulation distance from 101 is increased.
Japanese Utility Model Publication No. 6-9120

  However, after the coil is wound around the bobbin 111, the lead wire 116 is connected to the terminal pin 114. In particular, the lead wire 116 connected to the terminal pin 114 at both ends of the terminal block 115, and the bottom surfaces of the both end magnetic legs 102 of the core There is a problem that a sufficient insulation distance cannot be obtained at the distance L1 between the two (see FIG. 18A).

  In order to avoid the above problems, for example, as shown in FIG. 18B, the center of the lower part of the bobbin so that the lead wires 116 connected to the terminal pins 114 at both ends are separated from the lower surfaces of the magnetic legs 102 at both ends of the core. The distance L2 between the lead wire 116 and the lower surface of the both end magnetic legs 102 of the core is increased by securing the insulation distance. However, such work is complicated and requires a lot of time, and the production efficiency is increased. There is a problem that decreases.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a transformer with good workability that can sufficiently secure an insulation distance between a lead wire and a core without routing the lead wire.

The transformer of the present invention made to achieve the above object is:
A winding drum portion for winding a plurality of coils, a flange portion provided at both ends of the winding drum portion, a terminal block provided orthogonal to the winding drum portion below the flange portion, and a lower portion of the terminal block A bobbin comprising a plurality of terminals extending to
A side magnetic leg mounted on the terminal block of the bobbin, a central magnetic leg that protrudes from the approximate center of the side magnetic leg at a substantially right angle and is inserted into the winding body of the bobbin, and from both ends of the side magnetic leg A closed magnetic path core comprising both end magnetic legs protruding in the same direction as the central magnetic leg and arranged on the outer periphery of the coil;
The lead wire of the coil is connected to the plurality of terminals from the lower part of the bobbin,
The side magnetic legs have a V shape and are inclined so that the upper surface and the lower surface gradually increase in parallel from the center toward both ends.
The side magnetic legs and the both end magnetic legs are formed in a substantially square cross section and have substantially the same cross-sectional area,
The lower part of the both end magnetic legs is formed higher than the central lower part of the side magnetic legs,
The upper part of the both end magnetic legs is formed lower than the upper part of the buttock of the bobbin ,
The central magnetic leg is formed in a columnar shape, and the diameter of the column is substantially the same as the height (H) of the side magnetic leg.
It is characterized by this.

  In the transformer of the present invention, it is preferable that the lower surface of the both-end magnetic legs is formed such that the inner side is higher than the outer side.

  According to the present invention, it is possible to sufficiently secure an insulation distance between the lead wire connected to the terminals at both ends of the terminal block and the both end magnetic legs of the core.

  Hereinafter, embodiments of the present invention will be exemplarily described based on the drawings. However, the material, shape, relative arrangement, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

(First embodiment)
FIG. 1 is an exploded perspective view of a transformer in the first embodiment. FIG. 2 is a completed perspective view of the transformer in FIG. 3 is a front view (a) and a side view (b) of the transformer in FIG. 4 is a cross-sectional view of the transformer in FIG. 2 taken along the line F-F. 5 is a perspective view of the transformer in FIG. 2 as viewed from below. FIG. 6 shows a modification of the core of the transformer in FIG.

  1 to 6, the transformer 1 in this embodiment includes a bobbin 20 formed of an insulating resin, a coil 2 wound around the bobbin 20, and a core 10 placed on the bobbin 20. This is a horizontal type in which the core 10 is laid down so as to lie down.

  The bobbin 20 is provided below the flange portion 22, a winding drum portion 21 that winds the plurality of coils 2, a substantially circular flange portion 22 that is provided at both ends of the winding drum portion 21 and protrudes from the outer periphery of the winding drum portion 21. Terminal block 23 and a plurality of terminals 25 which are implanted in the terminal block 23 and extend downward.

  The terminal block 23 protrudes outward from the flange portion 22 and is formed in a plate shape that is orthogonal to the winding drum portion 21. On the upper surface of the terminal block 23, a core mounting surface 24 having a V-shape in side view is provided.

  The coil 2 is coated with an insulating material and includes a primary winding 3 on the high voltage side and a secondary winding 4 on the low voltage side. The coil 2 is wound from the innermost periphery to the primary winding 3, the secondary winding 4, the primary winding 3, and the secondary winding 4 alternately and concentrically, and the insulating tape 5 is wound around the outermost periphery. Wind.

  The primary winding 3 and the secondary winding 4 are provided on both sides of the bobbin 20 and the primary winding 3 and the secondary winding in all the layers in order to ensure an insulation distance (creeping distance and spatial distance) between the upper and lower layers. A barrier tape 6 is wound between the wires 4 and an insulating tape 5 is wound between the upper and lower layers. The lead wires 7 of the coil 2 are wired from the lower part of the bobbin 20 so as not to contact each other, and are entangled with a plurality of terminals 25 and soldered.

  The core 10 has a V-shaped side magnetic leg 11, a central magnetic leg 15 that protrudes from the center 12 of the side magnetic leg at a substantially right angle and is inserted into the winding body 21 of the bobbin 20, and both ends 13 of the side magnetic leg. The two magnetic legs 14 project in the same direction as the central magnetic leg 15 and are arranged on the outer periphery of the coil 2.

  The side magnetic legs 11 and the both end magnetic legs 14 of the core 10 are formed in a substantially square cross section and have substantially the same cross sectional area. The central magnetic leg 15 of the core 10 is formed in a cylindrical shape that is slightly smaller than the diameter of the hole 21 </ b> A of the bobbin body 21 of the bobbin 20, and this cylindrical diameter is substantially the same as the height H of the side magnetic legs 11. . The cross-sectional area of the central magnetic leg 15 of the core 10 is formed to be at least twice the cross-sectional area of the both-end magnetic legs 14 and the side magnetic legs 11 of the core 10. Therefore, even if the shape of the core 10 is changed, the magnetic flux density flowing through the core 10 does not decrease.

The side magnetic legs 11 of the core 10 are placed on the core placement surface 24 of the terminal block 23 as shown in FIG. The side magnetic legs 11 are formed so that the upper and lower surfaces of the side magnetic legs 11 gradually become substantially parallel from the center 12 of the side magnetic legs on which the central magnetic legs 15 are arranged toward both ends 13 of the side magnetic legs on which both end magnetic legs 14 are arranged. It is inclined to be higher.
Therefore, as it goes to both ends of the side magnetic leg 11, the both ends 13 of the side magnetic leg 11 and the lower part of the both end magnetic legs 14 are formed higher than the lower part of the center 12 of the side magnetic leg. The distance L3 from the lower surface of the lead wire to the lead wire 7 connected to the terminals 26 at both ends is compared with the distance L1 from the bottom surface of the conventional magnetic pole 102 at both ends to the lead wire 116 connected to the terminals at both ends shown in FIG. The transformer can be made long without drawing the lead wire, and a transformer with very good workability can be obtained by securing a sufficient insulation distance.

  The terminal block 23 is provided with the core mounting surface 24 having a V-shape when viewed from the side. Therefore, both ends of the terminal block 23 shown in FIG. 1 are formed high, but the center height of the terminal block 23 is as shown in FIG. The height of the terminal block 115 is the same as that of the conventional terminal block 115, and the central height of the terminal block 23 does not extend.

  Further, both ends 13 of the side magnetic legs 11 of the core 10 and upper portions of the both end magnetic legs 14 are formed lower than the upper portions of the flange portions 22 of the bobbin 20. Therefore, a sufficient insulation distance can be secured without increasing the height, and the market demand for a reduced height can be met.

  When assembling the transformer 1, the coil 2 is wound around the winding body portion 21 of the bobbin 20, the lead wire 7 of the coil 2 is connected to the plurality of terminals 25, and then the insulating tape 5 is wound around the outer periphery of the coil 2. After that, the central magnetic legs 15 of the pair of cores 10 are inserted into the winding body part 21 of the bobbin 20 so that the open ends are abutted, and the side magnetic legs 11 and the both end magnetic legs 14 of the core 10 are placed on the upper surface of the terminal block 23. Place on surface 24. When the core 10 is placed on the core placement surface 24, the side magnetic legs 11 are disposed above the plurality of terminals 25, and both ends 13 of the side magnetic legs are disposed above both ends of the terminals 25. Then, as shown in FIG. 2, an adhesive 27 is applied between the cores 10 or between the cores 10 and the flanges 22 to complete the transformer 1.

  Note that the combination of the pair of cores 10 described above may be a core in which the center magnetic leg 15 and both end magnetic legs 14 are extended as shown in FIG. 6 and a V-shaped core 19 without the center magnetic leg 15 and both end magnetic legs 14. Good.

(Second Embodiment)
FIG. 7 is an exploded perspective view of the transformer in the second embodiment. FIG. 8 is a completed perspective view of FIG. 9 is a front view (a) and a side view (b) of the transformer in FIG. 10 is a completed perspective view of the transformer in FIG. 8 as viewed from below.
7 to 10, the same components as those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The second embodiment is different from the first embodiment in that a side magnetic leg having a V shape and a substantially rectangular side magnetic leg shown in FIG. The side magnetic legs 11 are made higher by the amount S that the lower ends of both ends 13 and both end magnetic legs 14 are raised upward, and both ends 13 of the side magnetic legs 11 and upper parts of both end magnetic legs 14 are higher than the upper part of the flange 22 of the bobbin 20. The upper surface of the terminal block 23 has a flat surface on which the core 10 is placed.

  Even in this case, the distance L4 from the lower surface of the both-end magnetic legs 14 shown in FIG. 10 to the lead wire 7 connected to the terminals 26 at both ends is from the lower surface of the conventional both-end magnetic legs 102 shown in FIG. Compared with the distance L1 to the lead wire 116 connected to the terminal of the lead wire, the lead wire can be made long without being routed, and a transformer with a very good workability can be obtained by securing a sufficient insulation distance, and the magnetic flux density flowing through the core Therefore, the conventional bobbin can be used and the cost can be reduced.

(Third embodiment)
FIG. 11 is an exploded perspective view of the transformer in the third embodiment. 12 is a front view (a) and a side view (b) of the completed transformer in FIG. FIG. 13 is a perspective view of the completed transformer in FIG. 11 viewed from below.
11 to 13, the same components as those of the second embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The third embodiment differs from the second embodiment in that, as shown in FIG. 11, a side surface 14A of both end magnetic legs 14 facing the center magnetic leg 15 of the core 10 and a lower surface 14B of both end magnetic legs 14 A step portion 16 is provided between them, and the lower surface 14B of the magnetic legs 14 at both ends is formed such that the inner side is formed higher than the outer side.

Even if it does in this way, while obtaining the same effect as the above, the distance L5 from the lower surface of the both-ends magnetic leg 14 shown in FIG. 13 to the leader line 7 connected to the terminal 26 of both ends is the both-ends magnetic leg shown in FIG. Compared to the distance L4 from the lower surface of 14 to the lead wire 7 connected to the terminals 26 at both ends, the distance can be further increased, and a transformer with very good workability can be obtained by securing a sufficient insulation distance.
Moreover, as shown in FIG. 14, even if the inclined portion 17 is provided from the inner side to the outer side of the lower surface of the both end magnetic legs 14 of the core 10, the same effect as described above can be obtained.

It is a disassembled perspective view of the trans | transformer in the 1st Embodiment of this invention. FIG. 2 is a completed perspective view of the transformer in FIG. 1. FIG. 3 is a front view (a) and a side view (b) of the transformer in FIG. 2. FIG. 6 is a cross-sectional view of the transformer in FIG. 2 taken along line FF. It is the perspective view which looked at the transformer in Drawing 2 from the lower part. It is a modification of the core of the transformer in FIG. The disassembled perspective view of the trans | transformer in 2nd Embodiment is shown. FIG. 8 is a completed perspective view of the transformer in FIG. 7. FIG. 9A is a front view and a side view of the transformer in FIG. 8. It is the completion perspective view which looked at the transformer in Drawing 8 from the lower part. The disassembled perspective view of the trans | transformer in 3rd Embodiment is shown. It is the front view (a) and side view (b) of the completed transformer in FIG. It is the perspective view which looked at the completed transformer in Drawing 11 from the lower part. It is a modification of the core in FIG. It is a disassembled perspective view of the conventional transformer. FIG. 16 is a completed perspective view of the transformer in FIG. 15. It is the front view (a) and side view (b) of the transformer in FIG. It is the perspective view (a) which looked at the trans | transformer before routing the leader line in FIG. 16 from the downward direction, and the perspective view (b) which looked at the transformer which led the leader line from the bobbin lower center.

DESCRIPTION OF SYMBOLS 1 Transformer 7 Leader 10 Core 11 Side magnetic leg 12 Center of side magnetic leg 13 Both ends of side magnetic leg 14 Both ends magnetic leg 15 Central magnetic leg 20 Bobbin 22 Hook 23 Terminal block 25 Terminal 26 Terminal of both ends

Claims (2)

A winding drum portion for winding a plurality of coils, a flange portion provided at both ends of the winding drum portion, a terminal block provided orthogonal to the winding drum portion below the flange portion, and a lower portion of the terminal block A bobbin comprising a plurality of terminals extending to
A side magnetic leg mounted on the terminal block of the bobbin, a central magnetic leg that protrudes from a substantially central part of the side magnetic leg into a substantially rectangular shape and is inserted into a winding body of the bobbin, and A closed magnetic path core comprising both end magnetic legs that protrude from both ends in the same direction as the central magnetic leg and are arranged on the outer periphery of the coil;
The lead wire of the coil is connected to the plurality of terminals from the lower part of the bobbin,
The side magnetic legs have a V shape and are inclined so that the upper surface and the lower surface gradually increase in parallel from the center toward both ends.
The side magnetic legs and the both end magnetic legs are formed in a substantially square cross section and have substantially the same cross-sectional area,
The lower part of the both end magnetic legs is formed higher than the central lower part of the side magnetic legs,
The upper part of the both end magnetic legs is formed lower than the upper part of the buttock of the bobbin ,
The central magnetic leg is formed in a columnar shape, and the diameter of the column is substantially the same as the height (H) of the side magnetic leg.
Transformer characterized by that. The lower surface of the both end magnetic legs is formed such that the inside is higher than the outside.
The transformer according to claim 1.